Furnace



April 17, 1928.

l. w. FQLTZ FURNACE inal Filed on. 16. 1920 Patented Apr. ,17, 192e,.

f i U T D. S T S N T OFFICE v IRA w. Form, or CHICAGO, ILLINOIS.

] URN CE."

Original application filed October 16, 1920, sermnofliiaMa Divided andthis application fiied' r September 17', 1323. Serial naeeaiw. Y

This application for patent a division 7 of patent application, SerialNo; tl'l fli fii,

' vfurnaces.

, rent of hot air and 0 This inventionpreferably relates to a furnace ofthatgeneral class where at least a part of theair supplied to the fuelis preheated. The purposes of the invention are to provide a practicaldesign for use in connection with steam boilers and for render ing afurnace more eflicient for heating the boiler, and incidentallypreventing loss of fuel in the products of coinbustioi'i. I I

These objects are accomplished by the use of certain air conduits inconjunetion with reflecting pier formations, all of which areconstructed within the brick sett ng surrounding the boiler. r v

Bymeans'of the piers the currents of hot air and gas are broken up bytheir direct impact upon'the piers, and thereby an extensive admixtureof the air and the gases is attained in the early stages of combustion.

This furnace is especially designedto burn with high efliciencyandfwithout smoke, coal that contains large quantitiesofvolatile matter,andis the result of manyyears of xperin'ienting in actual furnacepractice in I connection with steam bo1lers,w'ith mechanical st'okersaswell as with hand fired equipment. In constructing this'furnace thefollowing elements are carefully considered: (1) the kindlingtei'nperature of thegases of the coal; (2) the quantity ofair' re quiredunder average conditions of operation; the time necessary'to completetheprocess of combustion; (4) the dimensions of the firebox, combustionchamber, breeching and stack; (5.) themovement of the curgasv necessaryto cause the gas to properly combine with the oxygen of the air. Bymeans of this furnace the gases produced from the-burning coal areignited near the point of their liberation,

excess. air can be eliminated by proper contrjol of the ashpit doors or.of the stack damper, and a fairly uniform temperature increased. I i 1These objects are accomplished by the decan'be maintained throughout thefurnace,

and thereby all the combustible elements may be consumed, the quantityof ash and elinkers reduced to a minimum, the heating surfaces of theboiler kept clean, and the capacity andefliciency of the boiler greatlyand in, front of wing vice shownin the accompanying drawing, in

whichv I v Figure l is a longitudinal sectional view of the wallstructureof a furnace constructed according to this invention and; showsthe boiler in side elevation. 'lhi s view is taken on the line 11 Figure2.

Figure 2 is a' sectional plan view-taken on the line 22 of Figure 1',but with the directs these currents against the faceof pier et causing asecond reflection and eddying of the gas and air mixture. 1 In theoperation of the furnace the usual fuel'bedismaintained on the -g'rate.The

wall 4.1,1thus bridge wall" 4.1 and the pier 3 at the middle thereon arelocated at the rear of the grate 'atright angles with the lateral wallsof the furnace. Thethroats 6 and 7 are made as small in area as isconsistent with a proper and sufficient draft, 111' the furnace, The

bridge wall and'thepier thereon are dis posed at right angles to thegeneral flow of theflcurrents of air and gasin the-furnace and thusgive" a (llIGCt impact to those cursui'face thereof, whereby thosecurrents are caused to rebound and eddy, and thereby the air and gasesare commixed resultingin complete combustion of the gases. The wingpiers -5 are also disposed at'right angles to those currents and standand tothe rear ofthe throats 6 and 7 in the bridge wall. After passingthrough the throats 6 and 7 these currents impinge on the front face orsurface ofgwing piers 5 directly] opposite with a, direct impact'thatcauses them to rebound and eddy again and'then flow through.

the single throat 8 between the wing piers 5, and from there on to pier4-, all of which movements in" such currents tend to promote thoroughandv complete combustion of the combustible elements of the coal. Thepiers 90 rents as they impinge on'the front face or 3, 5 and 4c havestill another important function. By reason of their formation the frontface or surface of each pier operates as a reflector to the fire in thefurnace, whereby heat is reflected towards the front of the furnaceresulting in an increased temperature in the grate region of the furnaceand thereby creating a condition favorable for the burning of the gasesas they are liberated from the fuel andcompletely consuming them nearthe point of their liberation.

I claim:

1. A furnace comprising surrounding walls forming a fire-box andcombustion chamber, a grate in said fire-box located above the level ofthe floor of said combustion chamber, a bridge wall located at the rearof said grate, a pier on said bridge wall near the middle thereof andextending from the top thereof substantially to the roof of saidfurnace,the. front surface of said pier being at right angles \flth theside walls of said furnace and the lateral sides thereof being parallelwith the side walls of the furnace, and wing piers joined to the sidewalls of said furnace at point rearwardly and equidistant from saidbridge wall, said wing piers extending from the floor of said combustionchamber substantially to the roof thereof, the front surface of saidwing piers being at, right angles with the side walls of said furnace, apier located rearwardly from said wing piers near the middle of saidcombustion chamber and extending from the floor thereof substantially tothe roof thereof, tl1e front surface of said pier being at right angleswith the side walls of said furnace.

"2. A furnace comprising 7 surrounding walls forming a fire-box andcombustion chamber, a grate in said fire box located above the level ofthe floor of said combustion chamber, a bridge wall located at the rearof said grate, a pier on said bridge wall near the middle thereof andextending from the top thereof substantially to the roof of saidfurnace, the front surface of said pier being at right angles with theside walls of said furnace and the lateral sides thereof being parallelwith the side walls of the furnace, and wing piers joined to the sidewalls of said furnace at a point rearwardly and equidistant from saidbridge wall, said wing piers extending from the floor of said combustionchamber substantially to the roof thereof, the front surface of saidwing piers being at right angles with the side walls vof said furnaceand the lateral sides thereof'being parallel with the side walls of saidfurnace, a pier located rearwardly from said wing piers near the middleof said combustion chamber and extending from the. floor thereofsubstantially to the roof thereof, the front surface of said pier beingat right angles with the side walls of said furnace.

3. A furnace comprising surrounding walls forming a fire-box andcombustion.

chamber, a grate structure in said. furnace located above the normalfloor level of said combustion chamber, a bridge wall located: at therear of said grate, a pier onlsaid bridge wall near the middle thereofand extending from the top thereof substantially to the roof of saidfurnace, the front surface of said pier being .at right. angles with theside walls of said furnace and the lateral sides thereof being parallelwith the side walls of said furnace, and wing piers'joined to the sidewalls of said, furnace at a point rearwardly and equidistant from saidbridge wall, said wing piers extending from the floor of said combustionchamber substantially to the roof thereof, the front surface of saidwing piers being at right angles with the side walls of said furnace, apier located.

rearwardlyfrom said wing piers near the middle of said combustionchamber and eX- tending from the floor thereof substantially to the roofthereof, the front surface of said pier being at right angles withthe'side walls of said furnace. V

Signed at Ghicagothis 14th day of September, 1923. A

y IRA W. FOLTZ,

